OK, this question probably requires familiarity with the anime show itself, but if you can answer it anyway by all means..
I'm trying to find the music associated, pretty much only to my recollection, with the series of episodes involving Raijuta. There was one piece in particular (Maybe the only piece?) that I'm trying to find. I guess you might call it his "battle" theme, though I certainly cannot say if it is named as such (I doubt it.)
I've tried OSTs 1-4 and haven't heard it. I've begun looking over the Director's Collection and some other things and am beginning to lose hope.